6.8 Testing secondary system supervision functions
6.8.1 Fuse failure supervision SDDRFUF
Prepare the IED for verification of settings as outlined in 5.1 "Preparing the IED to
verify settings".
Values of the logical signals for SDDRFUF are available on the local HMI under
Main menu/Tests/Function status/Secondary system supervision/SDDRFUF/
SDDRFUF:1. The Signal Monitoring in PCM600 shows the same signals that are
available on the local HMI.
The verification is divided in two main parts. The first part is common to all fuse
failure supervision options, and checks that binary inputs and outputs operate as
expected according to actual configuration. In the second part the relevant set operate
values are measured.
6.8.1.1 Checking that the binary inputs and outputs operate as expected
1. Simulate normal operating conditions with the three-phase currents in phase
with their corresponding phase voltages and with all of them equal to their rated
values.
2. Connect the nominal dc voltage to the DISCPOS binary input.
• The signal BLKU should appear with almost no time delay.
• No signals BLKZ and 3PH should appear on the IED.
• Only the distance protection function can operate.
• Undervoltage-dependent functions must not operate.
3. Disconnect the dc voltage from the DISCPOS binary input terminal.
4. Connect the nominal dc voltage to the MCBOP binary input.
• The BLKU and BLKZ signals should appear without any time delay.
• All undervoltage-dependent functions must be blocked.
5. Disconnect the dc voltage from the MCBOP binary input terminal.
6. Disconnect one of the phase voltages and observe the logical output signals on
the binary outputs of the IED.
BLKU and BLKZ signals should appear simultaneously wether the BLKU and
BLKZ reset depends on the setting SealIn “on” or “off”. If “on” no reset, if “off”
reset.
7. After more than 5 seconds disconnect the remaining two-phase voltages and all
three currents.
• There should be no change in the high status of the output signals BLKU
and BLKZ.
• The signal 3PH will appear.
8. Establish normal voltage and current operating conditions simultaneously and
observe the corresponding output signals.
Section 6 1MRK 502 049-UEN A
Testing functionality
94
Commissioning manual
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